Does the health of espresso baristas really affect coffee?

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There are many things and precautions for a barista to make a cup of espresso (Espresso), which is seen as simple in the eyes of the public.

Apart from the quality of the beans, the stability of the machine, the changes in the weather, the factors that can influence a good cup of coffee, and the skill and proficiency of the barista.

I think another more important factor is the barista's health, which here refers not only to physical health, but also psychologically.

Whether the barista is happy or sad, serious or careless, these things can be reflected in the process of making a cup of coffee, sometimes the shop is busy, whether the quality of coffee will decline.

Or maybe you are in an inexplicably irritable mood today, and when you produce it casually, even if the guest is not at the bar watching the barista make it, it will be a different feeling to have this cup of coffee in the guest's mouth.